Method of making shank stiffeners



R. E. BARTELS METHOD OF MAKING SHANK STIFFENERS Filed June 30, 1922 f II he F207? #3 74, Izaak??? 12' 561 262? Patented Apr. 13, 1926.

REINI-IARD E, BARTELS, OF LYNN, MASSACHUSETTS.

PATENT OFFICE.

METHOD OF MAKING SHANK STIFFENERS.

Application filed June so, 1922. Serial' No. 571,859.

To all whom it may concern:

Be it known that I, REINHARD E. BARTELS, a citizen of the United States,residingat Lynn, in the county of Essex and State of Massachusetts, haveinvented new and useful Improvements in Methods of Making ShankStilfeners, of which the following is a specitherefrom at 7 prongs 8spaced to correspond These two stiffener memfication.

This invention relates to shank stiifeners nore particularly intendedfor welt shoes, though applicable to other types of shoes,

and provides a construction by which great stiffness and strength may beprovided with comparatively little weight. For this pur pose thestiffener is substantially tubular in cross section between its endswhere the stress of use is greatest, this tubular construction beingpreferably formed by two stifiener members or blanks fixed face to face,one of these blanks being curved laterally.

ber.

Figure 3 is a longitudinal section on line 3-3 of Figure 2.

Figure 4 is a side elevation of the members assembled ready forincorporation in the shoe.

Figure 5 is a cross section on line 55 of Figure 4;.

Figure 6 is a fragmentary inverted plan of a welt innersole showing thestiffener in position.

.Figure 7 is a section substantially on line 77 of Figure 6. a

One of the members forming the shank stiffener comprises a stiffsubstantially rectangular blank 1, preferably of metal, which is showndetached in Figure 1. The blank adjacent each end is provided with oneor more slots 2, as shown a pair of such slots being provided adjacenteach end of the blank. Outwardly of these slots the blank is punched outat 3 to form prongs 4 by which the stiffener may be fixed in position onthe shoe. The other stiffener member. is shorter than the blank 1 and isshown detached at 5 in .Figure 2. This member,.also preferably metallic,is curved laterally between its ends to form an arch-shaped portion 6and adjacent its ends it has struck with the slots 2. bers are thenassembled face to face with the prongs 8 extending through the slots 2 1and folded against the remote face of the member 1 as shown in Figure 4.The combined stiffener is then molded longitudinally to the shape shownin Figure 4, the longer member 1 being on the convened side of thetiffener. This curving of the stiffener causes the prongs 8 to be firmlyand tightly interlocked with the member 1 so that all looseness or playbetween the members is elimi nated. The arch 6 forms with the stiffenermember 1 a substantially tubular stiffener, one face being flat and theother rounded. This forms an exceedingly stifi' construction between theends of the stiffener where strength is of most importance and it isfiat at its ends where it is attached to the innersole.

In Figures 6 and 7 the stiffener so formed of the two members 1 and 5 isshown as attached to the innersole of a. welt shoe .between thestitch-receiving ribs 10, the prongs 4 extending into the innersole andclinched therein to fasten the stiffener in position. Having thusdescribed an embodiment of this invention it should be evident thatvarious changes and modifications might be made therein withoutdeparting from its spirit or scope as defined by the appended claims.

I claim:

'1. The method of forming a shank stiffener, which comprises forming apair of flat blanks of stiff material, molding one of said blanks to alateral curvature, interlocking said blanks face to face, and thenmolding the interlocked blanks to the desired longitudinal curvature. Y

"2. The method of forming a shank stiffener, which comprises forming apair of flat metal blanks one longer than the other, molding the shorterof said blanks to a lateral curvature, interlocking said blanks face toface, and then molding the interlocked blanks to the desiredlongitudinal curvature.

3. The method of forming a shank stifi? ener which comprises'forming apair of flat stiff metal blanks, one of said blanks having spaced slotstherethrough and the other of said blanks having tines spaced to passthrough said slots, assembling said blanks face to face with said tinesprojecting through said slots, bending the projecting portions of saidtines againstthe remote face of said slotted blank, and then molding theblanks to the desired longitudinal curvature.

l. The-method of forming a shank stiff ener which comprises forming apair of fiat stiff. metal blanks, one of said blanks havingspaced slots'therethrough and the other of saidblanks having tines spaced to passthrough said slots, molding, oneof said blanks to' a lateral curvature,assembling sald blanks face tov faceavith SttlCl' tmespro blanks and.tinesbeyond saidslots toward the ends of said blank, forming tinesinthe shorter of said blanks spaced to pass through said slots, unitingsaid blanks face to face by passing the tines of'said shorter blankthroughtheslots of said longer blank and clinching on the remote face ofsaid longer blank,.and then'molding said blanks thu assembled to thedesired longitudinal curvature.

(3. Themethod of forming a shank stiffener which comprises forming apair of flat stiff metal blanks one longer than theother, forming spacedslots in the longer of said blanks, and tinesbeyond-said slots towardthe ends-of said blank, forming tines in the shorter of said blanksspaced to passthrough saidslots, molding; said shorter blank to alateral curvature, uniting said blanks face to face by passing thetinesof;

said shorter blank through theslots of said longer blank and clinchingon the remote face of said longer blank, and then molding said blanksthus assembled to the desired signature.

REINHARD E; BARTELS.

